102 lines
2.7 KiB
CMake
102 lines
2.7 KiB
CMake
# Check for availability of atomic operations
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# This module defines
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# OPENTHREADS_HAVE_ATOMIC_OPS
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INCLUDE(CheckCXXSourceRuns)
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# Do step by step checking,
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CHECK_CXX_SOURCE_RUNS("
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#include <cstdlib>
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int main()
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{
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#ifdef __i386__
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// Bad, gcc behaves dependent on the compilers -march=... flags.
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// Since the osg::Referenced stuff is code distributed in headers, it is
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// unclear if we will have this feature available at compile time of the
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// headers. So just do not use this feature for 32 bit code.
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// May be we can implement around that limitation at some time..
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return EXIT_FAILURE;
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#else
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unsigned value = 0;
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void* ptr = &value;
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__sync_add_and_fetch(&value, 1);
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__sync_synchronize();
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__sync_sub_and_fetch(&value, 1);
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if (!__sync_bool_compare_and_swap(&value, 0, 1))
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return EXIT_FAILURE;
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if (!__sync_bool_compare_and_swap(&ptr, ptr, ptr))
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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#endif
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}
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" _OPENTHREADS_ATOMIC_USE_GCC_BUILTINS)
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CHECK_CXX_SOURCE_RUNS("
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#include <cstdlib>
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int main(int, const char**)
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{
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unsigned value = 0;
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void* ptr = &value;
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__add_and_fetch(&value, 1);
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__synchronize(value);
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__sub_and_fetch(&value, 1);
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if (!__sync_compare_and_swap(&value, 0, 1))
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return EXIT_FAILURE;
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if (!__sync_compare_and_swap(&ptr, ptr, ptr))
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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" _OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS)
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CHECK_CXX_SOURCE_RUNS("
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#include <atomic.h>
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#include <cstdlib>
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int main(int, const char**)
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{
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uint_t value = 0;
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void* ptr = &value;
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atomic_inc_uint_nv(&value);
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membar_consumer();
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atomic_dec_uint_nv(&value);
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if (0 != atomic_cas_uint(&value, 0, 1))
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return EXIT_FAILURE;
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if (ptr != atomic_cas_ptr(&ptr, ptr, ptr))
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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" _OPENTHREADS_ATOMIC_USE_SUN)
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CHECK_CXX_SOURCE_RUNS("
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#include <windows.h>
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#include <cstdlib>
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int main(int, const char**)
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{
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__declspec(align(32)) volatile long value = 0;
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__declspec(align(32)) volatile void* ptr = &value;
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InterlockedIncrement(&value);
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InterlockedDecrement(&value);
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if (0 != InterlockedCompareExchange(&value, 1, 0))
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return EXIT_FAILURE;
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if (ptr != InterlockedCompareExchangePointer(&ptr, ptr, ptr))
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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" _OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED)
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IF(NOT _OPENTHREADS_ATOMIC_USE_GCC_BUILTINS AND NOT _OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS AND NOT _OPENTHREADS_ATOMIC_USE_SUN AND NOT _OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED)
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SET(_OPENTHREADS_ATOMIC_USE_MUTEX)
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ENDIF(NOT _OPENTHREADS_ATOMIC_USE_GCC_BUILTINS AND NOT _OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS AND NOT _OPENTHREADS_ATOMIC_USE_SUN AND NOT _OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED) |